Sylvania



P. P. STOKER S U T A R A P. P. A G N I L L O R T N O C C I F F A R T M wL I A R oo, K

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INVNTR. Pn u/ P Sto/(eff imag@ Reissued Nov. 24, 1931' UNITED STATESPATENTo-FFICE PAUL P. STOKER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TOTHE UNION & SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION FPENN-V SYLVAN IA RAILWAY TRAFFIC CONTROLLING APPARATUS Original No.1,727,183, dated September 3, 1929, Serial No 270,619, led April 17,1928; ApplicatilmA for reissue filed August-26', 1931. Serial No.559,567;

manner described is disclosed and claimed in an application for LettersPatent of the United States,.Serial No. 254,684, tiled February 16,1928, by Clarence S. Snavely, for railway traffic controlling apparatus,and my present invention relates to .an improvement on a portion of theapparatus disclosed inl said' application.

I will describe one form of apparatus embodying my invention, and willthen point out the novel features thereof in claims.

` The accompanying drawing is a diagrammatic view showing one form ofrailway tra'iic controlling apparatus embodying my invention.`

Referring to the drawing, the reference character A designates a codingdevice located at a train despatchers oiiice and arranged at times tosupply control codes to a pair of line wires 66 and 66EL for the controlotA traiiic governingdevices located at points remote from thedespatchers oiice and not shown inthe drawing. The coding device A# iscontrolled in part bv three manually operable keys K1, K2 and K3.arranged when operated to connect. terminal B of a source of energy notshown in the drawing with terminals 1, 2 or 3, respectively, of thecoding devlce.

The details ot'y the coding device AA are omitted from the drawing forthe sake of simplicity, but these details are completely disclosed inthe Snavely application identifiedv above, it being suilicient forpresent purposes to state that when key K2 is operated, the: codingdevice delivers to line wires 66 and 66", a control code whichclears-certain signals at a remote point.; when key K? is operatedcertain other signals at said pointl are cleared; and when key K]L isoperated all signals at said point are restored to the. stop: position.

Located also at they despatchers office, are two selectorsV S9 and S1",each com rising a contacty which is closed for a. brie *interval whenthe winding of the selector issupplied with a predetermined indicationcode. The selectors S9 and S10 are supplied with energy from a battery9A under the control of'e'ontact 139-of a relay EA whichlfaithfullyfollows the impulsesozt indication codes supplied to the.line wires. l y

The selectors S and S1 are responsiveto the condition of the trackcircuit associated with the signalsgovernedby keys K1, K2 and K3,selector S1 being. operated to close its contact when a train ventersthis section, and selector S9 being-operated to close its Contact when.the train leaves the track secti'on, as described in the Snavelyapplication reterred to hereinbeore.` When selectorl S `isfoperated,current isr supplied to the lefthand winding of a relay U from terminalsB andC to move armaturev 190 to aleft-haudpcsitionl in which it isillustrated in. the. drawing. When the armature occupies this position,lamp 192 is lighted to indicate tothe despatcher that the sectionthrough which traiiic is governed bv the. signa-ls controlled by keysK1, K2 and K3 is unoccupied. When selector S is operated,vhowever,current is supplied to the right-hand winding ofrelay U, armature 190 isswung to the right, and lamp 191 is lighted to indicate that the sectionis occupied bv a train.

In. systems of the type here. involved. it is usual to control thesignals associated with a section of track in such manner that when atrain occupies the section all signals will indicate stop, but that whenthe trai-nr leaves the section, any signal or signalswhich-were clearedbefore the train entered the section will return to the proceedposition. This is usually called semi-automatic control. It is sometimesdesirable, however, to introduce what is known4 as' stick controlof suchsignals This.l is laccomplished by arranging the signal control so thatafter a train enters and leaves a section, the signals will remain atstop until the despatcher takes suitable steps toagain clear a signal. n

In order to provide for stick control of the signals controlled bykeysK1, K2 and K3, in

the apparatus here shown, I have provided amanually operable ,pushbutton Y which is arranged when closed to connect the contact ofselector S1 in parallel with key K1.

In explaining the operationV of the appara-V tus, I Will assume thatpush button Y is closed aniclthat` the despatcher Vhas operated one ofthe keys K2 or K"s to clear asignal. If, now, a train enters the tracksection associated With such signal, an indication code will bedeliveredto the line Wires 66 and 66 which operates selector S10. Whenthe contact of this selector closes relay U is reversed, of

course, but in addition,rterminal B is conareaccomplished with theaddition of comlill parativelylittle apparatus in the' despatchersoii'ce only, and without affecting the 'operation ofthe remainder of theapparatus.

Although I have herein shown 'and described only oiie vform of railwaytraffic controlling apparatus embodying my invention,

it is understood that variouschanges and'Y` modifications may be madetherein Within the scope of the appended 'claims without departing ,fromthe 'spirit and scope of my invention.` Havin I claim is: Y 1. Incombination, a pair of line Wires at times supplied with an indicationcode, a coding device fora't times supplying a control codev tosaid'line Wires, a manually operable key for controlling said codingdevice, a selector responsive `to-said indication code and comprisng acontact, and manuallyV controlled means for Vat times Vconnecting thelcontact of said selector in parallel With said .,@Y-v i i 2. Incombination Vwith manually cont'rolled apparatus for transmittingdifferent control signals to a remote point, a relay at saidremotepoint, means selectively respon- 'sive to onesignal from saidapparatus for operating'said relay to one position and to another signalfrom saidapparatlis for movi ing said relay toa different position, arail- Lway signal controlled by saidrelay, indicag thus describedinvention, what tion means associated with said apparatus and controlledin accordance With traiic conditions at such remote point, and manuallycontrolled means for at times placing said apparatus under the controlof said indication means.

3. In combination With a railway signal,

va two-position relay for controlling said sig,-V na-l,fmanuallycontrolled transmitting means at a remote point for transmitting onesignal to momentarily operate the relay to one position and anothersignal. to momentarily opcrate they relay to a-notlierposition,indication means at said remote point, means for controlling saidindication means in accordani-e with traific conditions, and manuallycontrolled means at such remote point for placing said transmittingmeans under the control. of said indication means.

a two-position vrelay arranged to remain in either position untilactuated to the other position, means controlled by said relay forgoverning said signal, transmitting Ameans at a remote point forselectively actuating said relay to one position or the other,indication means at said remote point controlled by'tratlic conditionsadjacent said signal, means for at times controlling said transinittingmeans by said indication means, and

manually controlled means for at times removing said indication meansfrom the control o'f said transmitting means. Y

5.. In combination with a railway signal, a stick relay,i'ne'ans'controlled by said stick relay for governing said signal,transmitting means at a remote point for lselectively operating saidrelay, "indication means at said remote point responsive to tra'icconditions adjacent said'signal, means for at times conktrolling saidtransmitting means by said indication means, and manually controlledmeans for at times removing said indication means from the 'control-ofsaid transmitting means. Y

6. In combination With a section of railway track, a signal forgoverning traiiic over said section, a stick relay,fmeans forcontrolling' said signal to indicate Vproceed When the stick relayoccupies one position and stop when the stick relay occupies anotherposition, transmittingmeans at a. remote point for momentarilyselectively operating said stick relay to said `one or said otherpositions, indication means at said remotepoint, means responsive to theentrance of Va train into said section for actuating said indicationmeans, and means effective When said indication means is energized tocondition the transmittin'g means for operating the stickv relay to saidother position. v n

j 7. In combination with a section of'rail- Way. track, a signal forgoverning trailic over said sect-ion, a stick relay, means forcontrollingy said signal to indicate proceed when 4. In' combinationwith a railway signal,

the stick relay occupies one position and stop when the stick relayoccupies another position, transmitting means at a remote point formomentarily selectively operating said stick relay to said one or saidother positions, indication means at said remote point, means responsiveto the entrance of a train into said section for actuating saidindication means, means effective when said indication means isenergized to condition the transmitting means for operating the stickrelay to said other position, and manually controlled means for at timespreventing said control of the transmitting means by said indicationmeans.

8. In combination with a section of rail- Way track, a, signal forgoverning traffic over said section, a stick relay, means forcontrolling said signal to indicate proceed when u thestick relayoccupies one position and stop when the stick relay occupies anotherposition, transmitting means at a. remote point for momentarilyselectively operating said stick relay to said one or said otherpositions, 2;, indication means at said remote point, means responsiveto the entrance of a train into said section for actuating saidindication means, and means effective when said indication means isenergized to automatically initiate y operation of said transmittingmeans to operate the stick relay to said other position.

In testimony whereof I aiix mv signature.

PAUL P. STOKER.

